#!/usr/bin/python
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: ec2
short_description: create or terminate an instance in ec2, return instanceid
description:
     - Creates or terminates ec2 instances. When created optionally waits for it to be 'running'. This module has a dependency on python-boto >= 2.5
version_added: "0.9"
options:
  key_name:
    description:
      - key pair to use on the instance
    required: true
    default: null
    aliases: ['keypair']
  id:
    description:
      - identifier for this instance or set of instances, so that the module will be idempotent with respect to EC2 instances. This identifier is valid for at least 24 hours after the termination of the instance, and should not be reused for another call later on. For details, see the description of client token at U(http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Run_Instance_Idempotency.html).
    required: false
    default: null
    aliases: []
  group:
    description:
      - security group (or list of groups) to use with the instance
    required: false
    default: null
    aliases: [ 'groups' ]
  group_id:
    version_added: "1.1"
    description:
      - security group id (or list of ids) to use with the instance
    required: false
    default: null
    aliases: []
  region:
    version_added: "1.2"
    description:
      - The AWS region to use.  Must be specified if ec2_url is not used. If not specified then the value of the EC2_REGION environment variable, if any, is used.
    required: false
    default: null
    aliases: [ 'aws_region', 'ec2_region' ]
  zone:
    version_added: "1.2"
    description:
      - AWS availability zone in which to launch the instance
    required: false
    default: null
    aliases: [ 'aws_zone', 'ec2_zone' ]
  instance_type:
    description:
      - instance type to use for the instance
    required: true
    default: null
    aliases: []
  image:
    description:
       - I(emi) (or I(ami)) to use for the instance
    required: true
    default: null
    aliases: []
  kernel:
    description:
      - kernel I(eki) to use for the instance
    required: false
    default: null
    aliases: []
  ramdisk:
    description:
      - ramdisk I(eri) to use for the instance
    required: false
    default: null
    aliases: []
  wait:
    description:
      - wait for the instance to be in state 'running' before returning
    required: false
    default: "no"
    choices: [ "yes", "no" ]
    aliases: []
  wait_timeout:
    description:
      - how long before wait gives up, in seconds
    default: 300
    aliases: []
  ec2_url:
    description:
      - Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints).  Must be specified if region is not used. If not set then the value of the EC2_URL environment variable, if any, is used
    required: false
    default: null
    aliases: []
  aws_secret_key:
    description:
      - AWS secret key. If not set then the value of the AWS_SECRET_KEY environment variable is used. 
    required: false
    default: null
    aliases: [ 'ec2_secret_key', 'secret_key' ]
  aws_access_key:
    description:
      - AWS access key. If not set then the value of the AWS_ACCESS_KEY environment variable is used.
    required: false
    default: null
    aliases: [ 'ec2_access_key', 'access_key' ]
  count:
    description:
      - number of instances to launch
    required: False
    default: 1
    aliases: []
  monitoring:
    version_added: "1.1"
    description:
      - enable detailed monitoring (CloudWatch) for instance
    required: false
    default: null
    aliases: []
  user_data:
    version_added: "0.9"
    description:
      - opaque blob of data which is made available to the ec2 instance
    required: false
    default: null
    aliases: []
  instance_tags:
    version_added: "1.0"
    description:
      - a hash/dictionary of tags to add to the new instance; '{"key":"value"}' and '{"key":"value","key":"value"}'
    required: false
    default: null
    aliases: []
  placement_group:
    version_added: "1.3"
    description:
      - placement group for the instance when using EC2 Clustered Compute
    required: false
    default: null
    aliases: []
  vpc_subnet_id:
    version_added: "1.1"
    description:
      - the subnet ID in which to launch the instance (VPC)
    required: false
    default: null
    aliases: []
  private_ip:
    version_added: "1.2"
    description:
      - the private ip address to assign the instance (from the vpc subnet)
    required: false
    defualt: null
    aliases: []
  instance_profile_name:
    version_added: "1.3"
    description:
      - Name of the IAM instance profile to use. Boto library must be 2.5.0+
    required: false
    default: null
    aliases: []
  instance_ids:
    version_added: "1.3"
    description:
      - list of instance ids, currently only used when state='absent'
    required: false
    default: null
    aliases: []
  state:
    version_added: "1.3"
    description:
      - create or terminate instances
    required: false
    default: 'present'
    aliases: []

requirements: [ "boto" ]
author: Seth Vidal, Tim Gerla, Lester Wade
'''

EXAMPLES = '''
# Note: None of these examples set aws_access_key, aws_secret_key, or region.
# It is assumed that their matching environment variables are set.

# Basic provisioning example
- local_action:
    module: ec2
    keypair: mykey
    instance_type: c1.medium
    image: emi-40603AD1
    wait: yes
    group: webserver
    count: 3

# Advanced example with tagging and CloudWatch
- local_action:
    module: ec2
    keypair: mykey
    group: databases
    instance_type: m1.large
    image: ami-6e649707
    wait: yes
    wait_timeout: 500
    count: 5
    instance_tags: '{"db":"postgres"}'
    monitoring=yes

# Multiple groups example
local_action:
    module: ec2
    keypair: mykey
    group: ['databases', 'internal-services', 'sshable', 'and-so-forth']
    instance_type: m1.large
    image: ami-6e649707
    wait: yes
    wait_timeout: 500
    count: 5
    instance_tags: '{"db":"postgres"}'
    monitoring=yes

# VPC example
- local_action:
    module: ec2
    keypair: mykey
    group_id: sg-1dc53f72
    instance_type: m1.small
    image: ami-6e649707
    wait: yes
    vpc_subnet_id: subnet-29e63245


# Launch instances, runs some tasks
# and then terminate them


- name: Create a sandbox instance
  hosts: localhost
  gather_facts: False
  vars:
    keypair: my_keypair
    instance_type: m1.small
    security_group: my_securitygroup
    image: my_ami_id
    region: us-east-1
  tasks:
    - name: Launch instance
      local_action: ec2 keypair={{ keypair }} group={{ security_group }} instance_type={{ instance_type }} image={{ image }} wait=true region={{ region }}
      register: ec2
    - name: Add new instance to host group
      local_action: add_host hostname={{ item.public_ip }} groupname=launched
      with_items: ec2.instances
    - name: Wait for SSH to come up
      local_action: wait_for host={{ item.public_dns_name }} port=22 delay=60 timeout=320 state=started
      with_items: ec2.instances

- name: Configure instance(s)
  hosts: launched
  sudo: True
  gather_facts: True
  roles:
    - my_awesome_role
    - my_awesome_test

- name: Terminate instances
  hosts: localhost
  connection: local
  tasks:
    - name: Terminate instances that were previously launched
      local_action:
        module: ec2
        state: 'absent'
        instance_ids: {{ec2.instance_ids}}

'''

import sys
import time

AWS_REGIONS = ['ap-northeast-1',
               'ap-southeast-1',
               'ap-southeast-2',
               'eu-west-1',
               'sa-east-1',
               'us-east-1',
               'us-west-1',
               'us-west-2']

try:
    import boto.ec2
    from boto.exception import EC2ResponseError
except ImportError:
    print "failed=True msg='boto required for this module'"
    sys.exit(1)


def get_instance_info(inst):
    """
    Retrieves instance information from an instance
    ID and returns it as a dictionary
    """
    instance_info = {'id': inst.id,
                     'ami_launch_index': inst.ami_launch_index,
                     'private_ip': inst.private_ip_address,
                     'private_dns_name': inst.private_dns_name,
                     'public_ip': inst.ip_address,
                     'dns_name': inst.dns_name,
                     'public_dns_name': inst.public_dns_name,
                     'state_code': inst.state_code,
                     'architecture': inst.architecture,
                     'image_id': inst.image_id,
                     'key_name': inst.key_name,
                     'placement': inst.placement,
                     'kernel': inst.kernel,
                     'ramdisk': inst.ramdisk,
                     'launch_time': inst.launch_time,
                     'instance_type': inst.instance_type,
                     'root_device_type': inst.root_device_type,
                     'root_device_name': inst.root_device_name,
                     'state': inst.state,
                     'hypervisor': inst.hypervisor}
    try:
        instance_info['virtualization_type'] = getattr(inst,'virtualization_type')
    except AttributeError:
        instance_info['virtualization_type'] = None

    return instance_info

def boto_supports_profile_name_arg(ec2):
    """
    Check if Boto library has instance_profile_name argument. instance_profile_name has been added in Boto 2.5.0

    ec2: authenticated ec2 connection object

    Returns:
        True if Boto library accept instance_profile_name argument, else false
    """
    run_instances_method = getattr(ec2, 'run_instances')
    return 'instance_profile_name' in run_instances_method.func_code.co_varnames


def create_instances(module, ec2):
    """
    Creates new instances

    module : AnsibleModule object
    ec2: authenticated ec2 connection object

    Returns:
        A list of dictionaries with instance information
        about the instances that were launched
    """

    key_name = module.params.get('key_name')
    id = module.params.get('id')
    group_name = module.params.get('group')
    group_id = module.params.get('group_id')
    zone = module.params.get('zone')
    instance_type = module.params.get('instance_type')
    image = module.params.get('image')
    count = module.params.get('count')
    monitoring = module.params.get('monitoring')
    kernel = module.params.get('kernel')
    ramdisk = module.params.get('ramdisk')
    wait = module.params.get('wait')
    wait_timeout = int(module.params.get('wait_timeout'))
    placement_group = module.params.get('placement_group')
    user_data = module.params.get('user_data')
    instance_tags = module.params.get('instance_tags')
    vpc_subnet_id = module.params.get('vpc_subnet_id')
    private_ip = module.params.get('private_ip')
    instance_profile_name = module.params.get('instance_profile_name')


    # group_id and group_name are exclusive of each other
    if group_id and group_name:
        module.fail_json(msg = str("Use only one type of parameter (group_name) or (group_id)"))
        sys.exit(1)

    try:
        # Here we try to lookup the group id from the security group name - if group is set.
        if group_name:
            grp_details = ec2.get_all_security_groups()
            if type(group_name) == list:
                # FIXME: this should be a nice list comprehension
                # also not py 2.4 compliant
                group_id = list(filter(lambda grp: str(grp.id) if str(tmp) in str(grp) else None, grp_details) for tmp in group_name)
            elif type(group_name) == str:
                for grp in grp_details:
                    if str(group_name) in str(grp):
                        group_id = [str(grp.id)]
                group_name = [group_name]
        # Now we try to lookup the group id testing if group exists.
        elif group_id:
            #wrap the group_id in a list if it's not one already
            if type(group_id) == str:
                group_id = [group_id]
            grp_details = ec2.get_all_security_groups(group_ids=group_id)
            grp_item = grp_details[0]
            group_name = [grp_item.name]
    except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))

    # Lookup any instances that much our run id.

    running_instances = []
    count_remaining = int(count)

    if id != None:
        filter_dict = {'client-token':id, 'instance-state-name' : 'running'}
        previous_reservations = ec2.get_all_instances(None, filter_dict)
        for res in previous_reservations:
            for prev_instance in res.instances:
                running_instances.append(prev_instance)
        count_remaining = count_remaining - len(running_instances)

    # Both min_count and max_count equal count parameter. This means the launch request is explicit (we want count, or fail) in how many instances we want.

    if count_remaining == 0:
        changed = False
    else:
        changed = True
        try:
            params = {'image_id': image,
                      'key_name': key_name,
                      'client_token': id,
                      'min_count': count_remaining,
                      'max_count': count_remaining,
                      'monitoring_enabled': monitoring,
                      'placement': zone,
                      'placement_group': placement_group,
                      'instance_type': instance_type,
                      'kernel_id': kernel,
                      'ramdisk_id': ramdisk,
                      'subnet_id': vpc_subnet_id,
                      'private_ip_address': private_ip,
                      'user_data': user_data}

            if boto_supports_profile_name_arg(ec2):
                params['instance_profile_name'] = instance_profile_name
            else:
                if instance_profile_name is not None:
                    module.fail_json(
                        msg="instance_profile_name parameter requires Boto version 2.5.0 or higher")

            if vpc_subnet_id:
                params['security_group_ids'] = group_id
            else:
                params['security_groups'] = group_name

            res = ec2.run_instances(**params)
        except boto.exception.BotoServerError, e:
            module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

        instids = [ i.id for i in res.instances ]
        while True:
            try:
                res.connection.get_all_instances(instids)
                break
            except boto.exception.EC2ResponseError as e:
                if "<Code>InvalidInstanceID.NotFound</Code>" in str(e):
                    # there's a race between start and get an instance
                    continue
                else:
                    module.fail_json(msg = str(e))

        if instance_tags:
            try:
                ec2.create_tags(instids, module.from_json(instance_tags))
            except boto.exception.EC2ResponseError as e:
                module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))

        # wait here until the instances are up
        this_res = []
        num_running = 0
        wait_timeout = time.time() + wait_timeout
        while wait_timeout > time.time() and num_running < len(instids):
            res_list = res.connection.get_all_instances(instids)
            if len(res_list) > 0:
                this_res = res_list[0]
                num_running = len([ i for i in this_res.instances if i.state=='running' ])
            else:
                # got a bad response of some sort, possibly due to 
                # stale/cached data. Wait a second and then try again
                time.sleep(1)
                continue
            if wait and num_running < len(instids):
                time.sleep(5)
            else:
                break

        if wait and wait_timeout <= time.time():
            # waiting took too long
            module.fail_json(msg = "wait for instances running timeout on %s" % time.asctime())

        for inst in this_res.instances:
            running_instances.append(inst)

    instance_dict_array = []
    created_instance_ids = []
    for inst in running_instances:
        d = get_instance_info(inst)
        created_instance_ids.append(inst.id)
        instance_dict_array.append(d)

    return (instance_dict_array, created_instance_ids, changed)


def terminate_instances(module, ec2, instance_ids):
    """
    Terminates a list of instances

    module: Ansible module object
    ec2: authenticated ec2 connection object
    termination_list: a list of instances to terminate in the form of
      [ {id: <inst-id>}, ..]

    Returns a dictionary of instance information
    about the instances terminated.

    If the instance to be terminated is running
    "changed" will be set to False.

    """

    changed = False
    instance_dict_array = []

    if not isinstance(instance_ids, list) or len(instance_ids) < 1:
        module.fail_json(msg='instance_ids should be a list of instances, aborting')

    terminated_instance_ids = []
    for res in ec2.get_all_instances(instance_ids):
        for inst in res.instances:
            if inst.state == 'running':
                terminated_instance_ids.append(inst.id)
                instance_dict_array.append(get_instance_info(inst))
                try:
                    ec2.terminate_instances([inst.id])
                except EC2ResponseError as e:
                    module.fail_json(msg='Unable to terminate instance {0}, error: {1}'.format(inst.id, e))
                changed = True

    return (changed, instance_dict_array, terminated_instance_ids)



def main():
    module = AnsibleModule(
        argument_spec = dict(
            key_name = dict(aliases = ['keypair']),
            id = dict(),
            group = dict(type='list'),
            group_id = dict(type='list'),
            region = dict(aliases=['aws_region', 'ec2_region'], choices=AWS_REGIONS),
            zone = dict(aliases=['aws_zone', 'ec2_zone']),
            instance_type = dict(aliases=['type']),
            image = dict(),
            kernel = dict(),
            count = dict(default='1'),
            monitoring = dict(type='bool', default=False),
            ramdisk = dict(),
            wait = dict(type='bool', default=False),
            wait_timeout = dict(default=300),
            ec2_url = dict(),
            aws_secret_key = dict(aliases=['ec2_secret_key', 'secret_key'], no_log=True),
            aws_access_key = dict(aliases=['ec2_access_key', 'access_key']),
            placement_group = dict(),
            user_data = dict(),
            instance_tags = dict(),
            vpc_subnet_id = dict(),
            private_ip = dict(),
            instance_profile_name = dict(),
            instance_ids = dict(type='list'),
            state = dict(default='present'),
        )
    )

    ec2_url = module.params.get('ec2_url')
    aws_secret_key = module.params.get('aws_secret_key')
    aws_access_key = module.params.get('aws_access_key')
    region = module.params.get('region')


    # allow eucarc environment variables to be used if ansible vars aren't set
    if not ec2_url and 'EC2_URL' in os.environ:
        ec2_url = os.environ['EC2_URL']

    if not aws_secret_key:
        if  'AWS_SECRET_KEY' in os.environ:
            aws_secret_key = os.environ['AWS_SECRET_KEY']
        elif 'EC2_SECRET_KEY' in os.environ:
            aws_secret_key = os.environ['EC2_SECRET_KEY']

    if not aws_access_key:
        if 'AWS_ACCESS_KEY' in os.environ:
            aws_access_key = os.environ['AWS_ACCESS_KEY']
        elif 'EC2_ACCESS_KEY' in os.environ:
            aws_access_key = os.environ['EC2_ACCESS_KEY']

    if not region:
        if 'AWS_REGION' in os.environ:
            region = os.environ['AWS_REGION']
        elif 'EC2_REGION' in os.environ:
            region = os.environ['EC2_REGION']

    # If we have a region specified, connect to its endpoint.
    if region:
        try:
            ec2 = boto.ec2.connect_to_region(region, aws_access_key_id=aws_access_key, aws_secret_access_key=aws_secret_key)
        except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))
    # If we specified an ec2_url then try connecting to it
    elif ec2_url:
        try:
            ec2 = boto.connect_ec2_endpoint(ec2_url, aws_access_key, aws_secret_key)
        except boto.exception.NoAuthHandlerFound, e:
            module.fail_json(msg = str(e))
    else:
        module.fail_json(msg="Either region or ec2_url must be specified")

    if module.params.get('state') == 'absent':
        instance_ids = module.params.get('instance_ids')
        if not isinstance(instance_ids, list):
            module.fail_json(msg='termination_list needs to be a list of instances to terminate')

        (changed, instance_dict_array, new_instance_ids) = terminate_instances(module, ec2, instance_ids)

    elif module.params.get('state') == 'present':
        # Changed is always set to true when provisioning new instances
        if not module.params.get('key_name'):
            module.fail_json(msg='key_name parameter is required for new instance')
        if not module.params.get('image'):
            module.fail_json(msg='image parameter is required for new instance')
        (instance_dict_array, new_instance_ids, changed) = create_instances(module, ec2)

    module.exit_json(changed=changed, instance_ids=new_instance_ids, instances=instance_dict_array)


# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>

main()
